Uranium‐series dating of Pleistocene molluscan shells from southern California—An open system model
作者： B. J. Szabo , J. N. Rosholt
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摘要: Pleistocene molluscan shells from the marine deposits of southern California were dated by uranium-series disequilibrium method. The closed system ages calculated measured Th230/U234 and Pa231/U235 activity ratios. Because discordances found between Th230 Pa231 many shell samples analyzed, it was assumed that do not usually form an ideal system. A mathematical solution for open model can compensate deviation a sample is proposed. average first terrace at San Pedro Palos Verdes Hills Dume C Point to be near 85,000, 105,000, 130,000 years, respectively.
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